AirHint found the following cheapest one-way flights from Boston (BOS) to Frankfurt (FRA) in December 2025 (see full year).
One-Way flights
| 14 Dec | Icelandair | ||
| 15 Dec | Azores Airlines | ||
| 12 Dec | Frontier Airlines | ||
| 30 Dec | TAP | ||
| 25 Dec | Icelandair | ||
| 11 Dec | Aer Lingus | ||
| 16 Dec | Aer Lingus | ||
| 17 Dec | jetBlue | ||
| 18 Dec | Frontier Airlines | ||
| 30 Dec | United | direct |
Also check the deals for return flights from Boston to Frankfurt in December.
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